Marvel Premiere (1972) #56
Published Oct 1980 by Marvel.

"The Big Top Barter Resolution,"
Script by Len Wein (plot), Howard Chaykin (plot), and David Michelinie
In spring of 1938, a young Dum Dum Dugan bets his circus at the tables of the Mississippi Queen and loses to the house, leading to a brawl between him and thugs working for Spencer Keene, who had been trying to buy the circus from him; Dominic Fortune helps quell the fight in exchange for Sabbath forgiving his debts.

Ahh, the creations of Howard Chaykin. One of his earliest and best, natch, is his Atlas/Seaboard creation, Moro Frost aka The Scorpion. Unfortunately, the powers-that-were at Atlas didn't dig what Howard was doing, so by the third issue they'd replaced Chaykin and updated The Scorpion, complete with costume, into a sort of Spider-Man/Daredevil rip-off. Fortunately, Howard talked to the powers-that-were at Marvel, The Scorpion morphed into Dominic Fortune, and for a few years, Fortune popped up in various Marvel mags, gambling and chasing the bad-guys in the manner in which Chaykin had intended.

For sale